Haiku porting patches, Credit to Paul Davey.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83823 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Process.inc b/lib/System/Unix/Process.inc
index d715585..94e4c1b 100644
--- a/lib/System/Unix/Process.inc
+++ b/lib/System/Unix/Process.inc
@@ -91,7 +91,7 @@
   malloc_statistics_t Stats;
   malloc_zone_statistics(malloc_default_zone(), &Stats);
   return Stats.size_allocated;   // darwin
-#elif defined(HAVE_GETRUSAGE)
+#elif defined(HAVE_GETRUSAGE) && !defined(__HAIKU__)
   struct rusage usage;
   ::getrusage(RUSAGE_SELF, &usage);
   return usage.ru_maxrss;